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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "Game/Camera.h"
#include "Game/Game.h"
#include "Map/BaseGroundDrawer.h"
#include "Map/Ground.h"
#include "Map/ReadMap.h"
#include "Map/MapInfo.h"
#include "Rendering/GlobalRendering.h"
#include "Rendering/UnitDrawer.h"
#include "Rendering/GL/myGL.h"
#include "Rendering/Env/ISky.h"
#include "Rendering/Env/SunLighting.h"
#include "Rendering/Env/CubeMapHandler.h"
#include "System/Config/ConfigHandler.h"
CONFIG(int, CubeTexSizeSpecular).defaultValue(128).minimumValue(1);
CONFIG(int, CubeTexSizeReflection).defaultValue(128).minimumValue(1);
CubeMapHandler* cubeMapHandler = NULL;
CubeMapHandler::CubeMapHandler() {
envReflectionTexID = 0;
skyReflectionTexID = 0;
specularTexID = 0;
reflTexSize = 0;
specTexSize = 0;
currReflectionFace = 0;
specularTexIter = 0;
mapSkyReflections = false;
}
bool CubeMapHandler::Init() {
specTexSize = configHandler->GetInt("CubeTexSizeSpecular");
reflTexSize = configHandler->GetInt("CubeTexSizeReflection");
specTexBuf.resize(specTexSize * 4, 0);
mapSkyReflections = !(mapInfo->smf.skyReflectModTexName.empty());
{
glGenTextures(1, &specularTexID);
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, specularTexID);
glTexParameteri(GL_TEXTURE_CUBE_MAP_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
CreateSpecularFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, specTexSize, float3( 1, 1, 1), float3( 0, 0, -2), float3(0, -2, 0));
CreateSpecularFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, specTexSize, float3(-1, 1, -1), float3( 0, 0, 2), float3(0, -2, 0));
CreateSpecularFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, specTexSize, float3(-1, 1, -1), float3( 2, 0, 0), float3(0, 0, 2));
CreateSpecularFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, specTexSize, float3(-1, -1, 1), float3( 2, 0, 0), float3(0, 0, -2));
CreateSpecularFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, specTexSize, float3(-1, 1, 1), float3( 2, 0, 0), float3(0, -2, 0));
CreateSpecularFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, specTexSize, float3( 1, 1, -1), float3(-2, 0, 0), float3(0, -2, 0));
}
{
glGenTextures(1, &envReflectionTexID);
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, envReflectionTexID);
glTexParameteri(GL_TEXTURE_CUBE_MAP_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
if (mapSkyReflections) {
glGenTextures(1, &skyReflectionTexID);
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, skyReflectionTexID);
glTexParameteri(GL_TEXTURE_CUBE_MAP_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, 0, GL_RGBA8, reflTexSize, reflTexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
if (reflectionCubeFBO.IsValid()) {
reflectionCubeFBO.Bind();
reflectionCubeFBO.CreateRenderBuffer(GL_DEPTH_ATTACHMENT_EXT, GL_DEPTH_COMPONENT, reflTexSize, reflTexSize);
reflectionCubeFBO.Unbind();
}
if (!reflectionCubeFBO.IsValid()) {
Free();
return false;
}
return true;
}
void CubeMapHandler::Free() {
if (specularTexID != 0) {
glDeleteTextures(1, &specularTexID);
specularTexID = 0;
}
if (envReflectionTexID != 0) {
glDeleteTextures(1, &envReflectionTexID);
envReflectionTexID = 0;
}
if (skyReflectionTexID != 0) {
glDeleteTextures(1, &skyReflectionTexID);
skyReflectionTexID = 0;
}
}
void CubeMapHandler::UpdateReflectionTexture()
{
if (!unitDrawer->UseAdvShading())
return;
// NOTE:
// we unbind later in WorldDrawer::GenerateIBLTextures() to save render
// context switches (which are one of the slowest OpenGL operations!)
// together with VP restoration
reflectionCubeFBO.Bind();
switch (currReflectionFace) {
case 0: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, RgtVector, false); } break;
case 1: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, -RgtVector, false); } break;
case 2: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, UpVector, false); } break;
case 3: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, -UpVector, false); } break;
case 4: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, FwdVector, false); } break;
case 5: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, -FwdVector, false); } break;
default: {} break;
}
if (mapSkyReflections) {
// draw only the sky (into its own cubemap) for SSMF
// by reusing data from previous frame we could also
// make terrain reflect itself, not just the sky
switch (currReflectionFace) {
case 6: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, RgtVector, true); } break;
case 7: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, -RgtVector, true); } break;
case 8: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, UpVector, true); } break;
case 9: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, -UpVector, true); } break;
case 10: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, FwdVector, true); } break;
case 11: { CreateReflectionFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, -FwdVector, true); } break;
default: {} break;
}
currReflectionFace += 1;
currReflectionFace %= 12;
} else {
// touch the FBO at least once per frame
currReflectionFace += 1;
currReflectionFace %= 6;
}
}
void CubeMapHandler::CreateReflectionFace(unsigned int glType, const float3& camDir, bool skyOnly)
{
reflectionCubeFBO.AttachTexture((skyOnly? skyReflectionTexID: envReflectionTexID), glType);
glPushAttrib(GL_FOG_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(sky->fogColor[0], sky->fogColor[1], sky->fogColor[2], 1.0f);
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
if (!skyOnly) {
glDepthMask(GL_TRUE);
glEnable(GL_DEPTH_TEST);
} else {
// do not need depth-testing for the sky alone
glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);
}
{
CCamera* prvCam = CCamera::GetSetActiveCamera(CCamera::CAMTYPE_ENVMAP);
CCamera* curCam = CCamera::GetActiveCamera();
bool draw = true;
#if 0
switch (glType) {
case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB: { glClearColor(1.0f, 0.0f, 0.0f, 1.0f); draw = false; } break; // red
case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB: { glClearColor(0.0f, 1.0f, 0.0f, 1.0f); draw = false; } break; // green
case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB: { glClearColor(0.0f, 0.0f, 1.0f, 1.0f); draw = false; } break; // blue
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB: { glClearColor(1.0f, 1.0f, 0.0f, 1.0f); draw = false; } break; // yellow
case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB: { glClearColor(1.0f, 0.0f, 1.0f, 1.0f); draw = false; } break; // purple
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB: { glClearColor(0.0f, 1.0f, 1.0f, 1.0f); draw = false; } break; // cyan
default: {} break;
}
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
#endif
#if 1
// work around CCamera::GetRgtFromRot bugs
switch (glType) {
case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB: { /*fwd = Rgt*/ curCam->right = FwdVector; curCam->up = UpVector; } break;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB: { /*fwd = -Rgt*/ curCam->right = -FwdVector; curCam->up = UpVector; } break;
case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB: { /*fwd = Up*/ curCam->right = RgtVector; curCam->up = -FwdVector; } break;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB: { /*fwd = -Up*/ curCam->right = RgtVector; curCam->up = FwdVector; } break;
case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB: { /*fwd = Fwd*/ curCam->right = -RgtVector; curCam->up = UpVector; } break;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB: { /*fwd = -Fwd*/ curCam->right = RgtVector; curCam->up = UpVector; } break;
default: {} break;
}
if (draw) {
// env-reflections are only correct when drawn from an inverted
// perspective (meaning right becomes left and up becomes down)
curCam->forward = camDir;
curCam->right *= -1.0f;
curCam->up *= -1.0f;
// we want a *horizontal* FOV of 90 degrees; this gets us close
// enough (assumes a 16:10 horizontal aspect-ratio common case)
curCam->SetVFOV(64.0f);
curCam->SetPos(prvCam->GetPos());
#else
curCam->SetRotZ(0.0f);
curCam->SetDir(camDir);
#endif
curCam->UpdateLoadViewPort(0, 0, reflTexSize, reflTexSize);
// update matrices (not dirs or viewport)
curCam->Update(false, true, false);
// generate the face
game->SetDrawMode(CGame::gameReflectionDraw);
sky->Draw();
if (!skyOnly) {
readMap->GetGroundDrawer()->Draw(DrawPass::TerrainReflection);
}
game->SetDrawMode(CGame::gameNormalDraw);
}
CCamera::SetActiveCamera(prvCam->GetCamType());
prvCam->Update();
}
glPopAttrib();
}
void CubeMapHandler::UpdateSpecularTexture()
{
if (!unitDrawer->UseAdvShading())
return;
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, specularTexID);
int specularTexRow = specularTexIter / 3; //FIXME WTF
switch (specularTexIter % 3) {
case 0: {
UpdateSpecularFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, specTexSize, float3( 1, 1, 1), float3( 0, 0, -2), float3(0, -2, 0), specularTexRow, &specTexBuf[0]);
UpdateSpecularFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, specTexSize, float3(-1, 1, -1), float3( 0, 0, 2), float3(0, -2, 0), specularTexRow, &specTexBuf[0]);
break;
}
case 1: {
UpdateSpecularFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, specTexSize, float3(-1, 1, -1), float3( 2, 0, 0), float3(0, 0, 2), specularTexRow, &specTexBuf[0]);
UpdateSpecularFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, specTexSize, float3(-1, -1, 1), float3( 2, 0, 0), float3(0, 0, -2), specularTexRow, &specTexBuf[0]);
break;
}
case 2: {
UpdateSpecularFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, specTexSize, float3(-1, 1, 1), float3( 2, 0, 0), float3(0, -2, 0), specularTexRow, &specTexBuf[0]);
UpdateSpecularFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, specTexSize, float3( 1, 1, -1), float3(-2, 0, 0), float3(0, -2, 0), specularTexRow, &specTexBuf[0]);
break;
}
}
// update one face of one row per frame
specularTexIter += 1;
specularTexIter %= (specTexSize * 3);
}
void CubeMapHandler::CreateSpecularFacePart(
unsigned int texType,
unsigned int size,
const float3& cdir,
const float3& xdif,
const float3& ydif,
unsigned int y,
unsigned char* buf)
{
// TODO move to a shader
for (int x = 0; x < size; ++x) {
const float3 dir = (cdir + (xdif * (x + 0.5f)) / size + (ydif * (y + 0.5f)) / size).Normalize();
const float dot = std::max(0.0f, dir.dot(sky->GetLight()->GetLightDir()));
const float spec = std::min(1.0f, std::pow(dot, sunLighting->specularExponent) + std::pow(dot, 3.0f) * 0.25f);
buf[x * 4 + 0] = (sunLighting->modelSpecularColor.x * spec * 255);
buf[x * 4 + 1] = (sunLighting->modelSpecularColor.y * spec * 255);
buf[x * 4 + 2] = (sunLighting->modelSpecularColor.z * spec * 255);
buf[x * 4 + 3] = 255;
}
}
void CubeMapHandler::CreateSpecularFace(
unsigned int texType,
unsigned int size,
const float3& cdir,
const float3& xdif,
const float3& ydif)
{
std::vector<unsigned char> buf(size * size * 4, 0);
for (int y = 0; y < size; ++y) {
CreateSpecularFacePart(texType, size, cdir, xdif, ydif, y, &buf[y * size * 4]);
}
//! note: no mipmaps, cubemap linear filtering is broken
glTexImage2D(texType, 0, GL_RGBA8, size, size, 0, GL_RGBA, GL_UNSIGNED_BYTE, &buf[0]);
}
void CubeMapHandler::UpdateSpecularFace(
unsigned int texType,
unsigned int size,
const float3& cdir,
const float3& xdif,
const float3& ydif,
unsigned int y,
unsigned char* buf)
{
CreateSpecularFacePart(texType, size, cdir, xdif, ydif, y, buf);
glTexSubImage2D(texType, 0, 0, y, size, 1, GL_RGBA, GL_UNSIGNED_BYTE, buf);
}
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